forked from bartvdbraak/blender
da376e0237
Cycles uses code from some great open source projects, many thanks them: * BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs": http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/ * Open Shading Language for a large part of the shading system: http://code.google.com/p/openshadinglanguage/ * Blender for procedural textures and a few other nodes. * Approximate Catmull Clark subdivision from NVidia Mesh tools: http://code.google.com/p/nvidia-mesh-tools/ * Sobol direction vectors from: http://web.maths.unsw.edu.au/~fkuo/sobol/ * Film response functions from: http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
106 lines
3.5 KiB
C
106 lines
3.5 KiB
C
/*
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* Copyright 2011, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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CCL_NAMESPACE_BEGIN
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/* Voronoi */
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__device float svm_voronoi(NodeDistanceMetric distance_metric, NodeVoronoiColoring coloring,
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float weight1, float weight2, float weight3, float weight4,
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float exponent, float intensity, float size, float3 p, float3 *color)
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{
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float aw1 = fabsf(weight1);
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float aw2 = fabsf(weight2);
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float aw3 = fabsf(weight3);
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float aw4 = fabsf(weight4);
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float sc = (aw1 + aw2 + aw3 + aw4);
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if(sc != 0.0f)
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sc = intensity/sc;
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/* compute distance and point coordinate of 4 nearest neighbours */
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float da[4];
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float3 pa[4];
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voronoi(p/size, distance_metric, exponent, da, pa);
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/* Scalar output */
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float fac = sc * fabsf(weight1*da[0] + weight2*da[1] + weight3*da[2] + weight4*da[3]);
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/* colored output */
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if(coloring == NODE_VORONOI_INTENSITY) {
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*color = make_float3(fac, fac, fac);
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}
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else {
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*color = aw1*cellnoise_color(pa[0]);
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*color += aw2*cellnoise_color(pa[1]);
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*color += aw3*cellnoise_color(pa[2]);
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*color += aw4*cellnoise_color(pa[3]);
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if(coloring != NODE_VORONOI_POSITION) {
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float t1 = min((da[1] - da[0])*10.0f, 1.0f);
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if(coloring == NODE_VORONOI_POSITION_OUTLINE_INTENSITY)
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*color *= t1*fac;
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else if(coloring == NODE_VORONOI_POSITION_OUTLINE)
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*color *= t1*sc;
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}
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else {
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*color *= sc;
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}
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}
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return fac;
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}
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__device void svm_node_tex_voronoi(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
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{
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uint4 node2 = read_node(kg, offset);
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uint4 node3 = read_node(kg, offset);
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uint distance_metric, coloring, exponent_offset;
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uint size_offset, co_offset, fac_offset, color_offset;
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uint weight1_offset, weight2_offset, weight3_offset, weight4_offset;
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decode_node_uchar4(node.y, &distance_metric, &coloring, &exponent_offset, NULL);
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decode_node_uchar4(node.z, &size_offset, &co_offset, &fac_offset, &color_offset);
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decode_node_uchar4(node.w, &weight1_offset, &weight2_offset, &weight3_offset, &weight4_offset);
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float3 co = stack_load_float3(stack, co_offset);
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float weight1 = stack_load_float_default(stack, weight1_offset, node2.x);
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float weight2 = stack_load_float_default(stack, weight2_offset, node2.y);
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float weight3 = stack_load_float_default(stack, weight3_offset, node2.z);
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float weight4 = stack_load_float_default(stack, weight4_offset, node2.w);
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float exponent = stack_load_float_default(stack, exponent_offset, node3.x);
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float size = stack_load_float_default(stack, size_offset, node3.y);
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exponent = fmaxf(exponent, 1e-5f);
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size = nonzerof(size, 1e-5f);
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float3 color;
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float f = svm_voronoi((NodeDistanceMetric)distance_metric,
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(NodeVoronoiColoring)coloring,
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weight1, weight2, weight3, weight4, exponent, 1.0f, size, co, &color);
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if(stack_valid(fac_offset)) stack_store_float(stack, fac_offset, f);
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if(stack_valid(color_offset)) stack_store_float3(stack, color_offset, color);
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}
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CCL_NAMESPACE_END
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